Severed telecommunications cables disrupted ticketing and airport check-in systems at Alaska Airlines on Monday, creating long delays and cancellations for thousands of passengers traveling at the end of a busy holiday weekend.

The Seattle-based airline said in a statement that it had to manually process passengers at key hubs after its Sprint network, which services ticketing, reservations and check-in, went down at 7:30 a.m. Pacific time. Service came back up around noon.